(en) Michael Ayotte et Melinda Lamberty, Rapid Appraisal Sociolinguistic Survey among the Ngemba Cluster of Languages : Mankon, Bambili, Nkwen, Pinyin, and Awing. Bamenda, Santa, and Tubah Subdivisions, Mezam Division, North West Province, SIL International, , 50 p. (lire en ligne)